Originally Posted by Whiskey Tango
Meh. He's a villain. He's relevant to Thor and not much else, except that Hiddleston pushes some weird angsty sex buttons in the teenybopper crowd and they go all gooey as a result. He can appear in all the Thor movies you want but as far as Avengers is concerned he's done.
Maybe this is a virtue of the AVENGERS film pedigree, but far too many fans, new and old, are looking at Loki as a character that is going to go the "Spike" route, as it were.